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Find the National Instruments PXI-5112 at our website: Click HERE CALIBRATION PROCEDURE NI 5112 Introduction
This document contains step-by-step instructions for writing a calibration procedure for the National Instruments 5112 digitizer. This document is intended for metrology labs. It includes instructions for self-calibrating the NI 5112 and for verifying its performance using a variety of programming environments.
The measurement accuracy requirements of your application determine how often you should verify the performance of the NI 5112 digitizer. NI recommends that you perform a complete calibration at least once every year. You can shorten this interval to 90 days or six months based on the demands of your application. Contents
Introduction...... 1 Equipment and Other Test Requirements ...... 2 Test Equipment...... 2 Test Conditions...... 3 Documentation...... 3 Software ...... 3 Writing Your Calibration Procedure ...... 4 Self-Calibration Procedures ...... 5 Self-Calibrating the NI 5112 Digitizer ...... 5 Verification Procedures...... 6 Verifying the Internal Reference ...... 6 Verifying Vertical Offset ...... 8 Verifying Vertical Gain ...... 9 Verifying Full Bandwidth...... 11 Verifying 20 MHz Bandwidth ...... 13 Verifying Input Impedance...... 16 Verifying AC Coupling Cutoff Frequency ...... 17 Verifying Timing ...... 19 Verifying Trigger Sensitivity ...... 21 Verifying Random Interleaved Sampling Distribution (RIS) ...... 23 Where to Go for Support ...... 26 Equipment and Other Test Requirements
This section describes the equipment, test conditions, documentation, and software required for calibrating the NI 5112.
Test Equipment
Table 1. NI 5112 Calibration Equipment Specifications
Required Recommended Parameter Equipment Equipment Measured Necessary Specifications Signal Generator/ Fluke 9500B Vertical Gain DC ±25 mV to ±22.5 V, Ohmmeter Oscilloscope ±0.25% into 1 MΩ Calibrator AC Coupling sine wave 9–13 Hz ±100 ppm, 1.8 Vpp, ±2% into 1 MΩ Bandwidth ±2% amplitude flatness for leveled sine wave 100 kHz–100 MHz ±50 ppm, 1.5 Vpp, ±2% into 50 Ω Input 2-wire resistance accuracy of 0.25% for Impedance 50 Ω and 1 MΩ measurements Timing/RIS sine wave 10 kHz–10 MHz ±15 ppm, 1.8 Vpp, ±2% into 1 MΩ Trigger sine wave 100 kHz–10 MHz ±100 ppm, Sensitivity 300 mVpp, ±2% into 1 MΩ with CH0 and CH1; 750 mVpp with external trigger 5 1/2 Digit Digital NI 4060 Internal DC voltage accuracy of ±0.25% Multimeter Reference (±12.5 mV) when measuring ±5 V (DMM) BNC Cable — — 50 Ω BNC Shorting Cap — Vertical 0 VDC, ±0.6 mV Offset
NI 5112 Calibration Procedure 2 ni.com Test Conditions Follow these guidelines to optimize the connections and the environment during calibration: • Keep connections to the NI 5112 short. Long cables and wires act as antennae, picking up extra noise that can affect measurements. • Use a 50 Ω BNC coaxial cable for all connections to the digitizer. • Keep relative humidity between 10% and 90% noncondensing. • Maintain the temperature between 5 °C and 40 °C. • Allow a warm-up time of at least 15 minutes to ensure that the measurement circuitry of the NI 5112 is at a stable operating temperature.
Documentation This section describes the documentation you need for self-calibrating and externally verifying the NI 5112 digitizer. In addition to this calibration document, you may find the following documents helpful: • NI High-Speed Digitizers Help (Start»Programs»National Instruments»NI-SCOPE»Documentation) • NI High-Speed Digitizers Getting Started Guide • NI PXI./PCI-5112 Specifications
The calibration functions used in this procedure are described in the NI-SCOPE Function Reference Help and the NI-SCOPE VI Reference Help, which you can access through the NI High-Speed Digitizers Help.
You can download the latest versions of all documentation from ni.com/ manuals.
Software Calibration requires the latest version of the NI-SCOPE driver on the calibration system. The calibration functions are C function calls located in the NI-SCOPE instrument driver. These function calls are also valid for any compiler capable of calling a 32-bit DLL Many of the functions use constants defined in the niScopeCal.h file. To use these constants, you must include niScopeCal.h in your code when you write your calibration procedure.
NI-SCOPE supports programming for all NI digitizers in the following programming languages: National Instruments LabVIEW and LabWindows™/CVI™, Microsoft Visual C++, Microsoft Visual Basic, and Console C.
© National Instruments Corporation 3 NI 5112 Calibration Procedure Note Make sure the version of NI-SCOPE you are using supports the hardware model you are calibrating. When in doubt, you can download the latest version of NI-SCOPE from ni.com/idnet or ni.com/downloads.
You can download the latest version of NI-SCOPE from the Instrument Driver Network at ni.com/idnet, or from ni.com/downloads. For installation instructions, refer to the NI High-Speed Digitizers Getting Started Guide.
Writing Your Calibration Procedure NI-SCOPE includes all functions necessary for calibrating NI digitizers Because calibration support is included in niScope_32.dll, you can access it through any compiler capable of calling into a 32-bit DLL. If you use a C compiler, include the niScopeCal.h header file, which defines all calibration-specific functions and briefly explains the parameters. LabVIEW support is installed in niScopeCal.llb, and all calibration functions appear in the function palette. Refer to Table 2 for file locations.
Table 2. Calibration File Locations After Installing NI-SCOPE
File Name and Location Description Program Files\IVI\Bin\ NI-SCOPE driver containing the entire NI-SCOPE API, niScope_32.dll including calibration functions Program Files\IVI\Lib\msc\ NI-SCOPE library containing the entire NI-SCOPE niscope.lib API, including calibration functions
NI 5112 Calibration Procedure 4 ni.com Table 2. Calibration File Locations After Installing NI-SCOPE (Continued)
File Name and Location Description Program Files\IVI\Drivers\ LabWindows/CVI function panel file that includes niScope\niScopeCal.fp external verification function prototypes and help on using NI-SCOPE in the LabWindows/CVI environment Program Files\IVI\Drivers\ Directory of NI-SCOPE examples for niScope\Examples LabWindows/CVI, Console C, Visual C++, and Visual Basic Self-Calibration Procedures
The NI 5112 includes an internal voltage source that is more than 10 times as accurate as the 8-bit digitizer resolution. Self-calibration (or internal calibration) uses this internal reference source to do the following: • Calibrate vertical range and offset for each input range • Calibrate the compensated 1 MΩ attenuator • Calibrate analog trigger levels • Calibrate the time-to-digital converter (TDC) used for random interleaved sampling (RIS) measurements
The internal reference source is not user-adjustable, but you can verify the value of the source using a high-precision DMM to provide traceability. Absolute accuracy is ensured by verifying the internal reference voltage using a digital voltmeter.
Self-calibrate the NI 5112 digitizer before you perform an external verification. NI-SCOPE includes self-calibration example programs for LabVIEW, LabWindows/CVI, and Console C. Table 2 shows the locations of these example programs.
Self-Calibrating the NI 5112 Digitizer To self-calibrate the NI 5112, complete the following steps: 1. Call niScope_init to obtain an instrument session handle. 2. Call niScope_calSelfCalibrate with option set to VI_NULL. The new calibration constants are immediately stored in the EEPROM, so you can include this procedure in any application that uses the digitizer. 3. Call niScope_close to close the session handle and deallocate system resources.
© National Instruments Corporation 5 NI 5112 Calibration Procedure Verification Procedures
This section describes how to externally verify the performance of the NI 5112 digitizer.
External verification of the NI 5112 tests the following specifications: • Internal reference • Vertical offset • Vertical gain • Input impedance • Full bandwidth • 20 MHz bandwidth • AC coupling cutoff frequency • Timing • Trigger sensitivity • RIS distribution
The internal reference verification includes function calls to record the measured internal reference value in the EEPROM. External verification automatically stores the date and external verification count to provide traceability. External verification is equivalent to the factory production tests that verify the performance of the NI 5112.
Note Self-calibrate the NI 5112 before beginning these verification procedures. If any of the verification tests fail immediately after you self-calibrate the NI 5112, return it to NI for repair.
Verifying the Internal Reference Complete the following steps to verify the internal reference. 1. Connect the DMM to the input on the front panel of the NI 5112. 2. Open a calibration session by calling niScope_CalStart with the calibration password, which is initially set to 0 or the empty string, "". 3. Route the internal reference out of the digitizer by calling niScope_CalRouteInternalReference with the following parameters: • whichReference = NISCOPE_VAL_CAL_10V_CH0 • option = NISCOPE_VAL_CAL_POSITIVE 4. Measure the internal reference voltage with the DMM and record this value (y in this document).
NI 5112 Calibration Procedure 6 ni.com 5. Route the internal reference out of the digitizer by calling niScope_CalRouteInternalReference. Set the following parameters: • whichReference = NISCOPE_VAL_CAL_10V_CH0 • option = NISCOPE_VAL_CAL_NEGATIVE 6. Measure the internal reference voltage with the DMM and record this value (z in this document). 7. Calculate the value of the onboard reference x using the following formula: xyz= –
8. Compare x to the Success Condition value in Table 3. If the reference is outside of specification, return the digitizer to NI for repair. 9. If the digitizer passes the test, store the measured value to the driver by calling niScope_CalStoreInternalReference. Set the following parameters: • whichReference = NISCOPE_VAL_CAL_10V_CH0 • internalReference = x from step 7 10. Call niScope_CalRouteInternalReference to write the internal reference value to the EEPROM. Set the following parameters: • whichReference = NISCOPE_VAL_CAL_10V_CH0 • option = NISCOPE_VAL_CAL_UNROUTE_SIGNAL 11. Call niScope_CalEnd to end the verification session. Set action to NISCOPE_VAL_CAL_ACTION_STORE. Closing the calibration session stores the date and the incremented external verification count. While this value is not used by NI-SCOPE during operation, storing the value in the EEPROM provides traceability of the verification.
You have completed verifying the internal reference specifications for the NI 5112.
Table 3. NI 5112 Internal Reference Specifications
Digitizer Parameters Success Condition whichReference = 9.99 < x < 10.01 V NISCOPE_VAL_CAL_10V_CH0 option = NISCOPE_VAL_CAL_POSITIVE
© National Instruments Corporation 7 NI 5112 Calibration Procedure Verifying Vertical Offset Complete the following steps to verify NI 5112 vertical offset specifications. 1. Short-circuit channel 0 on the front panel of the of the NI 5112 with the BNC shorting cap. 2. Call niScope_init with the following parameters: • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 3. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = 100,000,000 • minNumPts = 30,000 • refPosition = 50.0 • numRecords = 1 • enforceRealtime = VI_TRUE 4. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = The Digitizer Parameters value in Table 4 • offset = 0.0 • coupling = NISCOPE_VAL_DC • probeAttenuation = 1.0 • enabled = VI_TRUE 5. Wait 10 ms for the input stage to settle. 6. Call niScope_InitiateAcquisition. 7. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_VOLTAGE_AVERAGE • timeout = 30 Compare the resulting average voltage to the Success Condition listed in Table 4. If the result is outside the Success Condition range, the digitizer has failed this portion of the verification. Return the digitizer to NI for repair. 8. Repeat steps 3 through 7 for each vertical offset entry in Table 4. 9. Move the shorting cap to channel 1.
NI 5112 Calibration Procedure 8 ni.com 10. Repeat steps 3 through 8 for channel 1. Change channelList to 1 when calling the functions niScope_ConfigureVertical and niScope_fetchMeasurement. 11. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
You have completed verifying the vertical offset specifications for the NI 5112.
Table 4. NI 5112 Vertical Offset Specifications
Digitizer Stimulus Success Name Parameters Parameters Condition Vertical Offset range = 50 V Short-Circuit Input |x| < 1.25 V Vertical Offset range = 5 V Short-Circuit Input |x| < 0.125 V Vertical Offset range = 0.5 V Short-Circuit Input |x| < 0.0125 V
Verifying Vertical Gain Complete the following steps to verify the NI 5112 vertical gain specifications: 1. Connect the signal generator to the channel 0 input of the digitizer. 2. Configure the signal generator for a 1 MΩ load. 3. Call niScope_init with the following parameters: • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 4. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = 100,000,000 • minNumPts = 30,000 • refPosition = 50.0 • numRecords = 1 • enforceRealtime = VI_TRUE 5. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = The first Digitizer Parameters value in Table 5 • offset = 0.0 • coupling = NISCOPE_VAL_DC
© National Instruments Corporation 9 NI 5112 Calibration Procedure • probeAttenuation = 1.0 • enabled = VI_TRUE 6. Wait 10 ms for the input stage to settle. 7. Apply the positive DC stimulus voltage listed under Stimulus Parameters in Table 5. 8. Call niScope_InitiateAcquisition. 9. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_VOLTAGE_AVERAGE • timeout = 30 10. Apply the negative DC stimulus voltage listed under Stimulus Parameters in Table 5. 11. Call niScope_InitiateAcquisition. 12. Call niScope_FetchMeasurement with the following parameters: • scalarMeasFunction = NISCOPE_VAL_VOLTAGE_AVERAGE • channelList = 0 • timeout = 30 13. Calculate the error in the vertical gain using the following formula:
error= () a– b – ()cd– where a is the measured positive voltage b is the measured negative voltage c is the applied positive voltage d is the applied negative voltage 14. Compare the value from step 13 to the Success Condition in Table 5. If the error is outside the range of the Success Condition, return the digitizer to NI for repair. 15. Repeat steps 4 through 14 for each Vertical Gain entry in Table 5. 16. Move the signal generator connection to the channel 1 input of the digitizer. 17. Repeat steps 4 through 15 for channel 1. Change channelList to 1 when calling the functions niScope_ConfigureVertical and niScope_FetchMeasurement. 18. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
NI 5112 Calibration Procedure 10 ni.com You have completed verifying the vertical gain specifications for the NI 5112.
Table 5. NI 5112 Vertical Gain Specifications
Digitizer Stimulus Success Name Parameters Parameters Condition Vertical Gain range = 50 V ±22.5 VDC |x| < 1.25 V Vertical Gain range = 50 V ±5.0 VDC |x| < 1.25 V Vertical Gain range = 5 V ±2.25 VDC |x| < 0.125 V Vertical Gain range = 5 V ±0.25 VDC |x| < 0.125 V Vertical Gain range = 0.5 V ±0.22 VDC |x| < 0.0125 V Vertical Gain range = 0.5 V ±0.022 VDC |x| < 0.0125 V
Verifying Full Bandwidth Complete the following steps to verify the NI 5112 full bandwidth specifications. 1. Connect the signal generator to the channel 0 input of the digitizer. 2. Configure the signal generator for a 50 Ω load. 3. Set the signal generator to the frequency and amplitude listed under Stimulus Parameters in Table 6 for the Reference Full Bandwidth entry. 4. Call niScope_init with the following parameters: • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 5. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = 2.0 • offset = 0 • coupling = NISCOPE_VAL_DC • probeAttenuation = 1.0 • enabled = VI_TRUE 6. Wait 300 ms for input stage to settle.
© National Instruments Corporation 11 NI 5112 Calibration Procedure 7. Call niScope_ConfigureChanCharacteristics with the following parameters: • channelList = 0 • inputImpedance = NISCOPE_VAL_50_OHM • maxInputFrequency = 0.0 8. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = The Digitizer Parameters value for Reference Full Bandwidth in Table 6 • minNumPts = 30,000 • refPosition = 50.0 • numRecords = 1 • enforceRealtime = VI_TRUE 9. Call niScope_InitiateAcquisition. 10. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_AC_ESTIMATE • timeout = 30 Record this value to use as reference AC estimate in step 15. 11. Apply the signal specified in the first Full Bandwidth entry in Table 6. 12. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = The Digitizer Parameters value for Full Bandwidth in Table 6 • minNumPts = 30,000 • refPosition = 50.0 • numRecords = 1 • enforceRealTime = VI_TRUE 13. Call niScope_InitiateAcquisition. 14. Call niScope_FetchMeasurement with the following parameters: • scalarMeasFunction = NISCOPE_VAL_AC_ESTIMATE • channelList = 0 • timeout = 30 Record this value to use as AC estimate in step 15.
NI 5112 Calibration Procedure 12 ni.com 15. Calculate the response in decibels using the following formula:
AC estimate response = 20log ------10 reference AC estimate
16. Compare the response to the Success Condition in Table 6. If the response is outside the range of the Success Condition, return the digitizer to NI for repair. 17. Repeat steps 11 through 16 for the remaining Full Bandwidth entries in Table 6. 18. Repeat steps 5 through 17 with coupling set to NISCOPE_VAL_AC when calling niScope_ConfigureVertical. 19. Move the signal generator connection to the channel 1 input of the digitizer. 20. Repeat steps 5 through 18 for channel 1. Change channelList to 1 for niScope_ConfigureVertical, niScope_FetchMeasurement, and niScope_ConfigureChanCharacteristics. 21. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
You have completed verifying the full bandwidth specifications for the NI 5112.
Table 6. NI 5112 Full Bandwidth Specifications
Digitizer Stimulus Success Name Parameters Parameters Condition Reference Full minSampleRate = 100 kHz, 1.5 Vpp — Bandwidth 20,000,000 S/s Full Bandwidth minSampleRate = 1 MHz, 1.5 Vpp |x| < 3 dB 100,000,000 S/s Full Bandwidth minSampleRate = 49 MHz, 1.5 Vpp |x| < 3 dB 50,000,000 S/s (intentionally aliased) Full Bandwidth minSampleRate = 99 MHz, 1.5 Vpp |x| < 3 dB 100,000,000 S/s (intentionally aliased)
Verifying 20 MHz Bandwidth Complete the following steps to verify the NI 5112 20 MHz bandwidth specifications. 1. Connect the signal generator to the channel 0 input of the digitizer. 2. Configure the signal generator for a 50 Ω load.
© National Instruments Corporation 13 NI 5112 Calibration Procedure 3. Set the signal generator to the frequency and amplitude listed in Table 7 for the Reference 20 MHz Bandwidth entry. 4. Call niScope_init with the following parameters: • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 5. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = 2.0 • offset = 0 • coupling = NISCOPE_VAL_DC • probeAttenuation = 1.0 • enabled = VI_TRUE 6. Wait 300 ms for the input stage to settle. 7. Call niScope_ConfigureChanCharacteristics with the following parameters: • channelList = 0 • inputImpedance = NISCOPE_VAL_50_OHM • maxInputFrequency = 20,000,000 8. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = The Digitizer Parameters value for Reference 20 MHz Bandwidth in Table 7 • minNumPts = 30,000 • refPosition = 50.0 • numRecords = 1 • enforceRealTime = VI_TRUE 9. Call niScope_InitiateAcquisition. 10. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_AC_ESTIMATE • timeout = 30 Record this value to use as reference AC estimate in step 15. 11. Apply the signal specified in the 20 MHz Bandwidth entry in Table 7. 12. Call niScope_ConfigureHorizontalTiming with the following parameters:
NI 5112 Calibration Procedure 14 ni.com • minSampleRate = The Digitizer Parameters value for the 20 MHz Bandwidth entry in Table 7 • minNumPts = 30,000 • refPosition = 50.0 • numRecords = 1 • enforceRealtime = VI_TRUE 13. Call niScope_InitiateAcquisition. 14. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_AC_ESTIMATE • timeout = 30 Record this value to use as AC estimate in step 15. 15. Calculate the response in decibels using the following formula:
AC estimate response = 20log ------10 reference AC estimate
16. Compare the response to the Success Condition in Table 7. If the response is outside the range of the Success Condition, return the digitizer to NI for repair. 17. Repeat steps 11 through 16 for the remaining bandwidth entries in Table 7. 18. Repeat steps 5 through 18 with coupling set to NISCOPE_VAL_AC for the function niScope_ConfigureVertical. 19. Move the signal generator connection to the channel 1 input on the front panel of the digitizer. 20. Repeat steps 5 through 18 for channel 1. Change channelList to 1 for niScope_ConfigureVertical, niScope_FetchMeasurement, and niScope_ConfigureChanCharacteristics. 21. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
You have completed verifying the 20 MHz bandwidth specifications for the NI 5112.
© National Instruments Corporation 15 NI 5112 Calibration Procedure Table 7. NI 5112 20 MHz Bandwidth Specifications
Digitizer Stimulus Success Name Parameters Parameters Condition Reference 20 MHz minSampleRate = 100 kHz, 1.5 Vpp — Bandwidth 20,000,000 S/s 20 MHz Bandwidth minSampleRate = 1 MHz, 1.5 Vpp |x| < 3 dB 100,000,000 S/s 20 MHz Bandwidth minSampleRate = 15 MHz, 1.5 Vpp |x| < 3 dB 20,000,000 S/s (intentionally aliased) 20 MHz Bandwidth minSampleRate = 25 MHz, 1.5 Vpp |x| > 3 dB 20,000,000 S/s (intentionally aliased)
Verifying Input Impedance Complete the following steps to verify NI 5112 input impedance specifications. 1. Connect the ohmmeter to the channel 0 input of the digitizer. 2. Call niScope_init with the following parameters: • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 3. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = The Digitizer Parameters value in Table 8 • offset = 0.0 • coupling = NISCOPE_VAL_DC • probeAttenuation = 1.0 • enabled = VI_TRUE 4. Wait 10 ms for the input stage to settle. 5. Call niScope_ConfigureChanCharacteristics with the following parameters: • channelList = 0 • inputImpedance = The Digitizer Parameters value in Table 8 • maxInputFrequency = 0.0
NI 5112 Calibration Procedure 16 ni.com 6. Call niScope_Read to ensure the hardware is programmed. Set the following parameters: • channelList = 0 • timeout = 30 • numSamples = 128 7. Measure the impedance with the ohmmeter and compare it to the Success Condition in Table 8. If the impedance is outside the range of the Success Condition, return the digitizer to NI for repair. 8. Repeat steps 3 through 7 for each input impedance entry in Table 8. 9. Move the ohmmeter connection to the channel 1 of the digitizer. 10. Repeat steps 3 through 8 for channel 1. Change channelList to 1 when calling the functions niScope_configureVertical niScope_ConfigureChanCharacteristics, and niScope_Read. 11. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
You have completed verifying the input impedance specifications for the NI 5112.
Table 8. NI 5112 Input Impedance Specifications
Name Digitizer Parameters SuccessCondition Input Impedance range = 40.0 V 990,000 < x < 1,010,000 Ω inputImpedance = NISCOPE_VAL_1_MEG_OHM Input Impedance range = 4.0 V 990,000 < x < 1,010,000 Ω inputImpedance = NISCOPE_VAL_1_MEG_OHM Input Impedance range = 0.4 V 990,000 < x < 1,010,000 Ω inputImpedance = NISCOPE_VAL_1_MEG_OHM Input Impedance range = 4.0 V 49.5 < x < 50.5 Ω inputImpedance = NISCOPE_VAL_50_OHM Input Impedance range = 0.4 V 49.5 < x < 50.5 Ω inputImpedance = NISCOPE_VAL_50_OHM
Verifying AC Coupling Cutoff Frequency Complete the following steps to verify NI 5112 AC coupling specifications. 1. Connect a the signal generator to channel 0 of the digitizer. 2. Configure the signal generator for a 1 MΩ load.
© National Instruments Corporation 17 NI 5112 Calibration Procedure 3. Set the signal generator to the frequency and amplitude listed in the Stimulus Parameters column in Table 9. 4. Call niScope_init with the following parameters: • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 5. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = 2.0 • offset = 0.0 • coupling = NISCOPE_VAL_DC • probeAttenuation = 1.0 • enabled = VI_TRUE 6. Wait 10 ms for the input stage to settle. 7. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = 10,000 • minNumPts = 10,000 • refPosition = 50.0 • numRecords = 1 • enforceRealtime = VI_TRUE 8. Call niScope_InitiateAcquisition. 9. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_AC_ESTIMATE • timeout = 30 Record this value to use as AC estimate with DC coupling in step 14. 10. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = 2.0 • offset = 0.0 • coupling = NISCOPE_VAL_AC • probeAttenuation = 1.0 • enabled = VI_TRUE 11. Wait 300 ms for the input stage to settle.
NI 5112 Calibration Procedure 18 ni.com 12. Call niScope_InitiateAcquisition. 13. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_AC_ESTIMATE • timeout = 30 Record this value to use as AC estimate with AC coupling in step 14. 14. Calculate the response in decibels using the following formula:
AC estimate with AC coupling response = 20log ------10 AC estimate with DC coupling
15. Compare the response to the Success Condition in Table 9. If the response is outside the listed range, return the digitizer to NI for repair. 16. Repeat steps 5 through 15 for each AC Coupling entry in Table 9. 17. Move the signal generator connection to the channel 1 input of the digitizer. 18. Repeat steps 5 through 16 for channel 1. Change channelList to 1 when calling the functions niScope_ConfigureVertical and niScope_FetchMeasurement. 19. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
You have completed verifying the AC coupling cutoff frequency specifications for the NI 5112.
Table 9. NI 5112 AC Coupling Specifications
Name Stimulus Parameters Success Condition AC Coupling 12.1 Hz, 1.8 Vpp |x| < 3 dB AC Coupling 9.9 Hz, 1.8 Vpp |x| > 3 dB
Verifying Timing Complete the following steps to verify the NI 5112 timing specifications. 1. Connect the signal generator to the channel 0 input of the digitizer. 2. Configure the signal generator for a 1 MΩ load. 3. Generate a 10 kHz, 1.8 Vpp sine wave.
© National Instruments Corporation 19 NI 5112 Calibration Procedure 4. Call niScope_init with the following parameters: • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 5. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = 2.0 • offset = 0.0 • coupling = NISCOPE_VAL_DC • probeAttenuation = 1.0 • enabled = VI_TRUE 6. Wait 10 ms for the input stage to settle. 7. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = 1,000,000 • minNumPts = 100,000 • refPosition = 50.0 • numRecords = 1 • enforceRealtime = VI_TRUE 8. Call niScope_InitiateAcquisition. 9. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_AVERAGE_FREQUENCY • timeout = 30 10. If the returned frequency value does not fall between 9,999 and 10,001 Hz, a hardware error exists. If the digitizer fails this step, terminate the verification procedure and return it to NI for repair. 11. Generate a 1.8 Vpp, 10 MHz sine wave. This wave is intentionally undersampled, where the sampling rate is an even multiple of the sine wave frequency. 12. Call niScope_InitiateAcquisition. 13. Call niScope_FetchMeasurement with the following parameters: • channelList = 0 • scalarMeasFunction = NISCOPE_VAL_AVERAGE_PERIOD • timeout = 30 Record the period measurement to use in step 15.
NI 5112 Calibration Procedure 20 ni.com 14. If the returned status is NISCOPE_ERROR_UNABLE_TO_PERFORM_MEASUREMENT, call niScope_errorHandler with errorCode set to the returned error value. If the timing is perfectly aliased, the waveform is a DC level and the period measurement fails. Therefore, if the error description indicates the measurement failed due to insufficient crosspoints, the digitizer passed the test. 15. If the returned status is anything other than NISCOPE_ERROR_UNABLE_TO_PERFORM_MEASUREMENT, calculate the actual sample rate (x), assuming a perfect source, with the following formula:
specified sample rate× source frequency × period x = ------source frequency× period – 1 which is:
1013 × period x = ------107 × period – 1
16. Compare the actual sample rate (x) to the Success Condition, 999,950 < x < 1,000,050 Hz. If x is outside the Success Condition range, return the digitizer to NI for repair. 17. Move the signal generator connection to the channel 1 input of the digitizer. 18. Repeat steps 5 through 16 for channel 1. Change channelList to 1 when calling niScope_ConfigureVertical and niScope_FetchMeasurement. 19. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
You have completed verifying the timing specifications for the NI 5112.
Verifying Trigger Sensitivity To verify trigger sensitivity, you must determine the smallest signal on which the digitizer can trigger by trying all possible trigger levels. Complete the following steps: 1. Connect the signal generator to the trigger channel input of the digitizer. 2. Configure the signal generator for a 1 MΩ load. 3. Apply a 1 MHz sine wave with zero vertical offset, and peak-to-peak voltage as listed in Table 10. 4. Call niScope_init with the following parameters:
© National Instruments Corporation 21 NI 5112 Calibration Procedure • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 5. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = 20 • offset = 0.0 • coupling = NISCOPE_VAL_DC • probeAttenuation = 1.0 • enabled = VI_TRUE 6. Wait 10 ms for the input stage to settle. 7. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = 20,000,000 • minNumPts = 128 • refPosition = 50.0 • numRecords = 1 • enforceRealtime = VI_TRUE 8. Call niScope_ConfigureTriggerEdge with the following parameters: • triggerSource = NISCOPE_VAL_EXTERNAL • level = The low trigger level from Table 10 • slope = NISCOPE_VAL_POSITIVE • triggerCoupling = NISCOPE_VAL_AC • holdoff = 0 • delay = 0 • channelList = 0 9. Call niScope_Read to read a waveform with the following parameters: • channelList = 0 • timeout = 0.1 • numSamples = 128 If this function returns a maximum time exceeded error, proceed to step 10. If the digitizer did not time out, skip to step 12. 10. Call niScope_Abort to stop the test.
NI 5112 Calibration Procedure 22 ni.com 11. If the digitizer timed out, increment the level setting by the trigger level delta specified in Table 10. The digitizer fails this test if incrementing the trigger level causes the trigger sensitivity to be higher than the high trigger level entry in Table 10. If the digitizer fails the test, return it to NI for repair. Otherwise, repeat steps 7 and 8 for the remaining trigger levels. 12. Repeat steps 2 through 10 to test the trigger sensitivity on channel 0. Make the following changes: •Change channelList to 0 when calling niScope_Read and niScope_ConfigureVertical •Change triggerSource to 0 when calling niScope_ConfigureTriggerEdge 13. Repeat steps 2 through 11 to test the trigger sensitivity on channel 1. Make the following changes: •Change channelList to 1 when calling niScope_Read and niScope_ConfigureVertical •Change triggerSource to 1 when calling niScope_ConfigureTriggerEdge 14. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
The digitizer passes the trigger sensitivity test if all channels pass the trigger susceptivity test. If any channel fails the test, return the digitizer to NI for repair.
You have completed verifying the trigger sensitivity for the NI 5112.
Table 10. NI 5112 Trigger Sensitivity Specifications
Digitizer Stimulus Success Name Parameters Parameters Condition Trigger Sensitivity low trigger level = –5.0 750 mVpp digitizer triggers with high trigger level = 5.0 any valid trigger level trigger level delta = 0.02
Verifying Random Interleaved Sampling Distribution (RIS) The TDC provides an extremely accurate trigger time resolution between two samples. This trigger should happen with a uniform distribution between two digitizer samples to accurately reconstruct the periodic signal. This method of trigger distribution is called RIS. Complete the following steps to measure RIS. 1. Connect the signal generator to the channel 0 input of the digitizer. This test requires a signal generator that is completely independent of
© National Instruments Corporation 23 NI 5112 Calibration Procedure the digitizer. The source cannot be a signal derived from the digitizer, and it cannot be the output of a function generator that is synchronized with the digitizer. 2. Configure the signal generator for a 1 MΩ load. 3. Apply the signal listed in the Stimulus Parameters column of Table 11. 4. Call niScope_init with the following parameters: • resourceName: The device name assigned by MAX • idQuery: VI_FALSE • resetDevice: VI_FALSE 5. Call niScope_ConfigureVertical with the following parameters: • channelList = 0 • range = 2 • offset = 0 • coupling = NISCOPE_VAL_DC • probeAttenuation = 1.0 • enabled = VI_TRUE 6. Call niScope_ConfigureHorizontalTiming with the following parameters: • minSampleRate = 100,000,000 • minNumPts = 128 • refPosition = 50.0 • numRecords = 1 • enforceRealtime = VI_TRUE 7. Call niScope_ConfigureTriggerEdge with the following parameters: • triggerSource = 0 • level = 0 • slope = NISCOPE_VAL_POSITIVE • triggerCoupling = NISCOPE_VAL_DC • holdoff = 0 • delay = 0
NI 5112 Calibration Procedure 24 ni.com 8. Call niScope_CalMeasureRISDistribution with the following parameters: • channelName = 0 • distributionSize = The Digitizer Parameters value in Table 11 • maxTime = 10,000 • distribution = A pointer to an array of distributionSize number of elements If you do not want distribution returned, set distribution to VI_NULL. The function niScope_CalMeasureRISDistribution performs 2,000 acquisitions and creates a probability distribution based on the initial x value, which includes the TDC value. 9. Compare the returned minimumBinPercent (x) to the Success Condition in Table 11. If the returned value is outside the range of the Success Condition, return the digitizer to NI for repair. 10. Move the signal generator connection to the channel 1 input of the digitizer. 11. Repeat steps 5 through 9 for channel 1 with the following changes: •Change channelList to 1 when calling niScope_ConfigureVertical •Change triggerSource to 1 when calling niScope_ConfigureTriggerEdge •Change channelName to 1 when calling niScope_CalMeasureRISDistribution 12. Call niScope_close with the following parameter: • vi: The instrument handle from niScope_init
You have completed verifying the RIS distribution for the NI 5112.
Table 11. NI 5112 RIS Distribution Specifications
Digitizer Parameters StimulusParameters Success Condition distributionSize = 25 1 MHz, ±100 kHz, 1.8 Vpp x > 0.8
Note If the NI 5112 digitizer fails any of the verification procedures immediately after a self-calibration, return it to NI for repair or replacement.
© National Instruments Corporation 25 NI 5112 Calibration Procedure Where to Go for Support
The National Instruments Web site is your complete resource for technical support. At ni.com/support you have access to everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.
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